改性J422焊条电弧焊碳钢接头在亚硫酸铵溶液中的耐蚀性

Corrosion of carbon steel joint used modified J422 electrode in ammonium sulfite

摘要: 针对亚硫酸铵介质中碳钢焊接接头腐蚀严重的实际,采用向普通碳钢焊条J422药皮中添加镍的方法,以三电极电化学研究方法和金相组织分析法研究了焊缝不同含镍量情况下碳钢焊接接头在亚硫酸铵溶液中的腐蚀行为。结果表明,镍元素的加入使得焊缝组织晶粒细化,针状铁素体减少;同时提高了碳钢焊接接头的自腐蚀电位;焊接接头在亚硫酸铵溶液中的极化率增大,自腐蚀电流减小;其中焊缝Ni元素含量为1.2%的焊接接头腐蚀速率最小。

Abstract: Since the welded joint of carbon steel is corroded seriously in the ammonium sulfite, corrosion behavior of welded joint welded by arc welding with J422 electrode containing different contents of Ni has been studied by means of three electrode galvanochemistry test and metallurgical structure analyses.The results show that the addition of Ni causes the grain refinement of the weld and the decrease of acicular ferrite.In addition, the polarizability of the weld increases and the corrosion current decreases in the ammonium sulfite.The welded joint containing 1.2 wt% Ni has the lowest corrosion rate.